Desktop printing machine



FIG. 1 is a perspective view of a desktop printing machine showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is right side elevational view thereof;

FIG. 4 is rear elevational view thereof;

FIG. 5 is left side elevational view there; and,

FIG. 6 is a top plan view thereof.

The broken lines are for purposes of illustration only and form no part of the claimed design. 

The ornamental design for a desktop printing machine, as shown and described. 